Prediction of the vibration response due to defects on rolling element bearings requires having an accurate representative vibration model In this paper a new model for vibration generation in the rolling element bearings has been introduced The proposed model assumes a stochastic source of vibration excitation which is produced as a result of metallic
Eight schoolgirls were seriously injured after jumping from a first floor classroom in panic mistaking the vibrations and sounds of a road roller for an earthquake in Pakistan s Punjab province
Abstract Al 2 O 3 ceramic powder was selected as research object and a DEM model of Al 2 O 3 ceramic powder flow was established Aiming at the effects of roller s vibrations on powder bed quality in additive manufacturing powder spreading
Summary The effects of downhole vibrations on the performance of poly crystalline diamond compact PDC bits have been well discussed in recent years However most studies on the downhole dynamics of roller cone bits have focused on axial vibration and its effects The questions that remain to be answered are what kinds of vibrations a roller cone bit
Mitigation of edgewise vibrations in wind turbine blades by means of roller dampers Journal of Sound and Vibration 333 21 5283 5298 publisher = "Pergamon Press" number = "21" } Zhang Z Li J Nielsen SRK & Basu Mitigation of edgewise vibrations in wind turbine blades by means of roller dampers AU Zhang Zili AU Li Jie
Roller presses are used to process bulk solids powder granules in order to perform a dry granulation by compaction They can typically produce a compacted sheet of material that is later milled even if some models have specific rollers whose shape allows to produce some briquettes This page is focusing on the design of roller presses the
Vibrations of roller bearings will be affected when a surface crack is caused in the bearing system Thus it is very helpful to study relationships between the sizes of the surface crack and vibrations of the bearings for detecting and diagnosing the surface crack in the bearing systems In this study a dynamic finite element model for a roller bearing with a vertical or
The research of rolling mill vibration theory has always been a scientific problem in the field of rolling forming which is very important to the quality of sheet metal and the stable operation of equipment The essence of rolling mill vibration is the transfer of energy which is generated from inside and outside Based on particle damping technology a dynamic vibration
When the roller contacts with the defect edge A it initially enters the defect zone If the roller reaches the edge B it will contact the defect bottom surface The roller begins to leave the bottom surface while it comes to the edge C The edge D is the end of the defect The deflection excitation δ d can be described by the following equations
Roller determined soil stiffness was found to be a function of the eccentric force and heterogeneity in moisture lift thickness and underlying stiffness has a considerable affect on roller vibration behavior
The roller profile shape can change the fatigue life and vibrations for planet roller bearing PRB as well as the impact between the rollers and cage In this study an analytical study of the dynamic forces and vibrations of a PRB considering the roller profile
Abstract Al 2 O 3 ceramic powder was selected as research object and a DEM model of Al 2 O 3 ceramic powder flow was established Aiming at the effects of roller s vibrations on powder bed quality in additive manufacturing powder spreading
In order to investigate the correlation between vibration and tribological phenomena a vibration data for lubricated bearing are plotted against the λ parameter as shown in Figure 4 The low level of vibration is detected for lambda above and unacceptable high level of vibration at lambda of with growing level of intermediate value
This paper describes the development and deployment of a comprehensive instrumentation system to monitor the vibration of a roller compactor Specific issues addressed in this paper include the selection and placement of accelerometers to capture the three dimensional response of critical roller components and the measurement of the rotating eccentric mass
The roller profile shape can change the fatigue life and vibrations for planet roller bearing PRB as well as the impact between the rollers and cage In this study an analytical study of the
In this paper vibration characteristics of a Vertical Roller Mill VRM are studied by using physical parameters of an operating VRM The mathematical model is derived and simulated for a set of working parameters Mechanical properties of the grinding material and the physical properties of the mechanical construction are used in the vibration model in order to
An investigation was conducted to characterize and relate in situ soil stress strain behavior to roller measured soil stiffness Continuous assessment of soil stiffness via roller vibration
The analysis of vibration signals is a major technique for monitoring the condition of machine components A focus of this paper is given to the early detection of very small bearing damages like false brinelling faults which occur in the presence of a small relative motion between the rollers and raceways during non rotation times
Surface waviness models utilized to describe the excitation events in the ball bearings BABs play an important role in predicting the vibrations of the ball bearing systems This work proposes a comparative study on the most relevant existing surface waviness models One model is named as time varying displacement TVD model which can only describe the
Vibrating machines represent some of the most challenging applications for bearings Spherical roller bearings for vibrating applications offer reliable operation across a broad range of applications inducing vibrations such as shaking screens road rollers exciters vibrating engines and planetary gearboxes acceleration levels and speeds are
For bearing analysis frequency domain approach is taken followed by experimentation for the detection of vibration signal in which single point defects are artificially created on roller and outer race then for vibration response these defected taper roller bearings are tested under different speed and loading conditions and resulting
